Log in

Relevant bibliographies by topics / Estuaries – South Africa / Journal articles

To see the other types of publications on this topic, follow the link: Estuaries – South Africa.

Journal articles on the topic 'Estuaries – South Africa'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Estuaries – South Africa.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Slinger, J. H., and C. M. Breen. "Integrated research into estuarine management." Water Science and Technology 32, no. 5-6 (September 1, 1995): 79–86. http://dx.doi.org/10.2166/wst.1995.0566.

Full text

Abstract:

Estuaries are under increasing pressure owing to agricultural, urban and industrial developments in their catchments and their status as favoured sites for coastal development and recreation. Effective research on South Africa estuaries requires the synthesis of available scientific knowledge to efficiently address management concerns and so ensure the sustainable utilisation of estuaries. The approach of the Consortium for Estuarine Research and Management to these problems and the results of a co-ordinated research programme on decision support for the management and conservation of estuarine systems are described in this paper. While the importance and current status of South African estuaries are considered, attention is devoted primarily to the development of an integrated modelling approach to the freshwater requirements of estuaries. In particular, the application of a linked system of five models to a case study, the Great Brak Estuary is described and the role of prediction in promoting wise decision making for estuaries is treated.

APA, Harvard, Vancouver, ISO, and other styles

2

Kisten, Yanasivan, Nadine A. Strydom, Renzo Perissinotto, and Sourav Paul. "Modelling the occurrence of postflexion stages of a marine estuarine-dependent fish in temperate South African estuaries." Scientia Marina 81, no. 1 (March 27, 2017): 27. http://dx.doi.org/10.3989/scimar.04521.05a.

Full text

Abstract:

The movement of postflexion larvae of marine estuarine-dependent species into estuaries is critical for the survival of fishes reliant on estuaries as nurseries. However, detailed studies focused on environmental variability experienced by postflexion larvae entering a range of estuary types under varying conditions are rare. This study assessed the in situ conditions (temperature, salinity and water clarity) under which the southern African endemic fish Rhabdosargus holubi (Sparidae) recruits into estuaries. Postflexion larvae were sampled in three biogeographic regions (cool temperate, warm temperate and subtropical boundary), which included three estuary types (permanently open estuaries (POEs), temporarily open/closed estuaries and estuarine lake systems) on a seasonal basis, independent of each other. Rhabdosargus holubi larvae were more abundant in spring and summer, in POEs in the warm temperate region. Models predicted that higher larval occurrence in estuaries is a function of lower salinity (e.g. mesohaline zones of 5-17.9 salinity) and lower water clarity (e.g. 0-0.2 Kd, light extinction coefficient), particularly for warm, temperate POEs. This re-emphasizes the importance of freshwater for optimal nursery functioning, which may be compromised by impoundments, abstraction and climate change in water-short countries like South Africa.

APA, Harvard, Vancouver, ISO, and other styles

3

McGregor, Steven, and Nadine A. Strydom. "The abundance, diversity and distribution of small fishes in mangrove and non-mangrove estuaries in warm temperate South Africa." Scientia Marina 82, no. 2 (July 6, 2018): 81. http://dx.doi.org/10.3989/scimar.04744.31a.

Full text

Abstract:

Mangroves in tropical and subtropical regions have been well documented in terms of the advantages they provide and their role in structuring ichthyofaunal assemblages, but little is known about their warm temperate counterparts. The study aimed to investigate the importance of warm temperate mangroves by comparing the abundance, diversity and distribution of small fishes in mangrove and non-mangrove estuaries in warm temperate South Africa. A 50x2 m (12-mm mesh) seine net was used over three summer seasons to sample small fishes in the Gonubie, Qora, Nahoon and Xhora estuaries (the latter two being mangrove estuaries). Fish abundance and diversity showed little variation among estuaries, despite the presence of mangroves. Estuaries in warm temperate areas are not only at the edge of mangrove distribution, but also offer alternative habitats which lend similar advantages to fish survival. It appears that warm temperate ichthyofauna have not yet evolved a dependence on mangrove systems in terms of the food, refuge and other ecological services they provide. Understanding the function of habitats and their value in enhancing fish survival in estuarine nursery areas is essential for fish conservation.

APA, Harvard, Vancouver, ISO, and other styles

4

Murray, Taryn S., Paul D. Cowley, Rhett H. Bennett, and Amber-Robyn Childs. "Fish on the move: connectivity of an estuary-dependent fishery species evaluated using a large-scale acoustic telemetry array." Canadian Journal of Fisheries and Aquatic Sciences 75, no. 11 (November 2018): 2038–52. http://dx.doi.org/10.1139/cjfas-2017-0361.

Full text

Abstract:

Connectivity — movements of animals between and among numerous habitats — and the factors (rhythmic cycles and environmental variables) influencing connectivity of juvenile Lichia amia (Teleostei: Carangidae) were assessed in complementary acoustic telemetry studies in two geographically separated estuaries (620 km apart) in South Africa. The studies were conducted within a nationwide array of acoustic receivers moored in estuaries and coastal waters. Tagged fish in both the Kowie (n = 21) and Goukou (n = 17) estuaries displayed high levels of multiple habitat connectivity, with 81% and 76% visiting nearby marine and estuarine environments, respectively. The presence of tagged L. amia within the tagging estuaries was significantly influenced by river and sea temperature (Kowie) and river inflow and moon phase (Goukou). Tidal phase, time of day, and season were found to significantly influence marine excursions undertaken by Kowie- and Goukou-tagged fish. Our study provides an assessment of connectivity among multiple estuarine, port, and marine habitats, relating those movements to rhythmic cycles and environmental variables, and highlights the benefits of tracking animals using an extensive acoustic receiver array that spans multiple habitats.

APA, Harvard, Vancouver, ISO, and other styles

5

Whitfield, A. "Predation on small juvenile fishes in shallow estuarine nursery areas: Reply to Baker & Sheaves (2021)." Marine Ecology Progress Series 662 (March 18, 2021): 209–14. http://dx.doi.org/10.3354/meps13678.

Full text

Abstract:

The key criticism by Baker & Sheaves (2021; Mar Ecol Prog Ser 662:205-208) of the Whitfield (2020; Mar Ecol Prog Ser 649:219-234) estuarine littoral predation paradigm review is that shallow water fish nursery habitats contain abundant predator assemblages which may create high predation pressure on the juvenile fish cohorts that occupy these areas. The primary arguments supporting Baker & Sheaves’ criticism arise from a series of papers published by them on piscivorous fish predation in certain tropical Australian estuaries. The counter-argument that shallow littoral areas in estuaries do indeed provide small juvenile fishes with refuge from small and large piscivorous fishes is provided by published papers from 4 different estuary types in South Africa, covering both subtropical and warm-temperate systems. Based on the overall published information, the argument for shallow (<1 m depth) estuarine waters providing major protection for newly settled juveniles appears to be weak in northern Australia but strong in South Africa. The global situation, as outlined in this response, is more supportive of low piscivorous predation in shallow nursery habitats, but further targeted research is needed before we can confirm that littoral estuarine waters are indeed a universal keystone attribute in this regard.

APA, Harvard, Vancouver, ISO, and other styles

6

Watt, D. A. "Estuaries of Contrasting Trophic Status in KwaZulu-Natal, South Africa." Estuarine, Coastal and Shelf Science 47, no. 2 (August 1998): 209–16. http://dx.doi.org/10.1006/ecss.1998.0345.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Taljaard, Susan, Gavin Snow, Phumelele Gama, and Lara van Niekerk. "Verification of a conceptual model of water quality for small temporarily open/closed estuaries: East Kleinemonde Estuary, South Africa." Marine and Freshwater Research 60, no. 3 (2009): 234. http://dx.doi.org/10.1071/mf07226.

Full text

Abstract:

The dynamics of the world’s larger permanently open estuaries have been well documented, but much less is known about the complex dynamics of smaller temporarily open/closed estuaries (TOCEs). Seventy per cent of South Africa’s 250 estuaries are classified as TOCEs, and many are less than 50 ha. A conceptual model of the water-quality dynamics of TOCEs has been proposed, primarily considering three hydrodynamic states (closed, semi-closed and open). This paper uses data from the East Kleinemonde Estuary, a small TOCE in the warm-temperate region of South Africa, to verify the model, focusing on physico-chemical parameters (salinity, temperature, pH, dissolved oxygen and turbidity) and inorganic macronutrients (dissolved inorganic nitrogen and dissolved inorganic phosphate) for the open and closed states. The results generally fitted the model in terms of the behaviour of the physico-chemical parameters and macronutrients in the water column. This knowledge provides a first approach to predict the water-quality dynamics in small TOCEs, thereby ensuring that the often limited resources are targeted at resolving uncertainties at appropriate temporal and spatial scales. TOCEs are not unique to South Africa and also occur along other coasts (Mediterranean and south-western Australia) where this type of model could also be applied.

APA, Harvard, Vancouver, ISO, and other styles

8

Bally, Roderick. "Conservation Problems and Management Options in Estuaries: The Bot River Estuary, South Africa, as a Case-history for Management of Closed Estuaries." Environmental Conservation 14, no. 1 (1987): 45–51. http://dx.doi.org/10.1017/s0376892900011097.

Full text

Abstract:

Closed (or ‘blind’) estuaries are common features, practically throughout the world, of areas experiencing markedly seasonal rainfall. The Bot River vlei is a closed estuary which faces considerable problems of management and conservation. For the past 100 years or more, the estuary has been opened to the sea every 2 to 5 years by artificial means. This has resulted in a very great variability of physical conditions and a concomitantly low diversity of organisms that are able to occupy the estuary permanently. Nevertheless, those species that do exist in the Bot River vlei are mostly estuarine species.

APA, Harvard, Vancouver, ISO, and other styles

9

Naidoo, Trishan, David Glassom, and Albertus J. Smit. "Plastic pollution in five urban estuaries of KwaZulu-Natal, South Africa." Marine Pollution Bulletin 101, no. 1 (December 2015): 473–80. http://dx.doi.org/10.1016/j.marpolbul.2015.09.044.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Montoya-Maya, P. H., and N. A. Strydom. "Zooplankton composition, abundance and distribution in selected south and west coast estuaries in South Africa." African Journal of Aquatic Science 34, no. 2 (August 2009): 147–57. http://dx.doi.org/10.2989/ajas.2009.34.2.5.892.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Nodo, P., N. C. James, A. R. Childs, and M. D. V. Nakin. "Response of demersal fish assemblages to an extreme flood event in a freshwater-deprived estuary in South Africa." Marine and Freshwater Research 69, no. 2 (2018): 253. http://dx.doi.org/10.1071/mf17096.

Full text

Abstract:

The Kariega Estuary in South Africa, is an example of a freshwater-deprived estuary. Large-scale water abstraction and droughts have resulted in this estuary either being uniformly marine or hypersaline. A major episodic flood event in October 2012, the largest ever recorded in this system, provided us with an opportunity to investigate the prolonged effect of an episodic flood on the demersal fish assemblage of a freshwater-deprived estuary. A beam trawl net was used for sampling the fish assemblages from December 2013 to November 2014. The flood event before the sampling period ‘reset’ the system, such that there was a longitudinal salinity gradient from the head to the mouth, which resulted in ‘normal’ estuarine conditions, typical of most estuaries. There was an increase in the abundance of benthopelagic marine migrant species, particularly early juveniles of important fishery species, in the middle and upper reaches during the present study relative to previous studies conducted in this freshwater-deprived system. This suggests increased recruitment of these species into their estuarine nursery habitat. The present study highlights the importance of understanding the effect of freshwater inflow on the demersal estuarine fish assemblage and the nursery role of this and other estuarine systems and their management.

APA, Harvard, Vancouver, ISO, and other styles

12

Paterson, Alexander Ross. "Maintaining the Ecological Flows of Estuaries: A Critical Reflection on the Application and Interpretation of the Relevant Legal Framework through the Lens of the Klein River Estuary." Potchefstroom Electronic Law Journal 21 (January 26, 2018): 1–39. http://dx.doi.org/10.17159/1727-3781/2018/v21i0a2781.

Full text

Abstract:

South Africa has 291 functional estuaries of which 43 per cent are threatened. These estuaries provide numerous environmental goods and services to the species situated within and adjacent to them. In an effort to improve the protection of the country’s estuaries and the environmental goods and services they provide, many laws of direct and indirect relevance to estuaries have been introduced over the past two decades. The provision of these environmental goods and services is however contingent upon maintaining the natural ecological flows inherent in estuaries. One significant threat to maintaining these natural ecological flows is the artificial opening of the mouth of an estuary, an action often triggered by the desire to protect private property against flooding when estuarine water levels rise. Decisions to artificially open the mouth of an estuary often therefore need to achieve a difficult balance between ecological (generally public) interests and proprietary (generally private) interests, a balance which should ideally be informed by the numerous laws, and their associated plans and policies, of direct relevance to protecting and managing estuaries. The courts have recently been called upon to resolve disputes regarding decisions about whether or not to artificially open the mouth of an estuary, and what one recent decision of the Supreme Court of Appeal in Abbott v Overstrand Municipality (2016) clearly illustrates is that there are not only significant challenges in the implementation of the legal framework of direct relevance to estuaries, but also in the judiciary’s understanding and application thereof. It furthermore illustrates distinct anomalies in the interpretation of the original, assigned and incidental executive authority of local government in relation to environmental matters, and that notwithstanding a swathe of recent relevant jurisprudence in this regard, confusion still abounds in this environmental governance quagmire.

APA, Harvard, Vancouver, ISO, and other styles

13

Hosking, S. G. "An Economic Approach to Allocating River Water to Estuaries in South Africa." Coastal Management 36, no. 1 (November 28, 2007): 35–46. http://dx.doi.org/10.1080/08920750701682015.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Riddin, T., and J. B. Adams. "The seed banks of two temporarily open/closed estuaries in South Africa." Aquatic Botany 90, no. 4 (May 2009): 328–32. http://dx.doi.org/10.1016/j.aquabot.2008.12.003.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

d’Udekem d’Acoz, Cédric, Hind Myrieme Chams Echchaoui, and Mohamed Menioui. "Further observations on North African and South Iberian Bathyporeia (Crustacea, Amphipoda), with the description of a new species." Contributions to Zoology 74, no. 3-4 (2005): 279–300. http://dx.doi.org/10.1163/18759866-0740304006.

Full text

Abstract:

A new species of amphipod, Bathyporeia watkini sp. nov. from the Atlantic coasts of North Africa is described. This very characteristic species is abundant in some lagoons and estuaries near 28°N. New morphological information on B. elkaimi d’Udekem d’Acoz and Menioui, 2004 is given after specimens that were recently collected on the Atlantic coasts of southern Spain and South Portugal. The male of B. ledoyeri d’Udekem d’Acoz and Menioui, 2004 is described for the first time and new records of North African B. guilliamsoniana (Bate, 1857) and B. chevreuxi d'Udekem d'Acoz and Vader, 2005a are discussed.

APA, Harvard, Vancouver, ISO, and other styles

16

Strydom, N. A., A. K. Whitfield, and T. H. Wooldridge. "The role of estuarine type in characterizing early stage fish assemblages in warm temperate estuaries, South Africa." African Zoology 38, no. 1 (April 2003): 29–43. http://dx.doi.org/10.1080/15627020.2003.11657192.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Ortega-Cisneros, K., and UM Scharler. "Variability and temporal stability of communities in estuaries (Mlalazi and Mpenjati, South Africa)." Marine Ecology Progress Series 500 (March 17, 2014): 11–24. http://dx.doi.org/10.3354/meps10658.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

SOLANO-FERNÁNDEZ, SOFÍA, COLIN G. ATTWOOD, RUSSELL CHALMERS, BARRY M. CLARK, PAUL D. COWLEY, TRACEY FAIRWEATHER, SEAN T. FENNESSY, et al. "Assessment of the effectiveness of South Africa's marine protected areas at representing ichthyofaunal communities." Environmental Conservation 39, no. 3 (April 16, 2012): 259–70. http://dx.doi.org/10.1017/s0376892912000070.

Full text

Abstract:

SUMMARYNational and international policies have encouraged the establishment of a representative network of marine protected areas (MPAs) in South Africa, with the aim of protecting marine biodiversity. The extent to which these marine and estuarine protected areas (EPAs) represent marine fish species and communities was assessed by comparing their species compositions with those of exploited areas, as sampled using four fishing techniques. Seven hundred fish species were sampled, representing one-third of South Africa's marine fishes. MPAs in coastal habitats scored c. 40% on the Bray-Curtis measure of similarity for species representativeness, but this score declined markedly for offshore ‘trawlable’ fishing grounds. The combined effects of sampling error, temporal variation and the effects of fishing on relative abundance suggest that 80% similarity would be the maximum achieveable. Forty-nine per cent of all fish species that were recorded were found in the 14 MPAs sampled. Redundancy in the MPA network was low, with fish species most commonly being represented in only one MPA or absent. There was greater redundancy in the 33 EPAs, with 40% of species being found in two or more EPAs, but many of these estuaries were adjacent to each other and embedded in large MPAs. Deep water fish communities (>80 m deep) and communities located on the west and south-east coasts of South Africa were most poorly represented by MPAs. Routine fishery surveys provide a robust and repeatable opportunity to assess species representativeness in MPAs, and the method used could form the basis of an operational definition of ‘representative’. In contrast to an assessment based on presence-absence data, this analysis of quantitative data presents a more pessimistic assessment of protection.

APA, Harvard, Vancouver, ISO, and other styles

19

Hosking, SG, and M. Du Preez. "A recreational valuation of the freshwater inflows into the Keurbooms estuary by means of a contingent valuation study." South African Journal of Economic and Management Sciences 7, no. 2 (April 28, 2004): 280–98. http://dx.doi.org/10.4102/sajems.v7i2.1380.

Full text

Abstract:

This paper reports on a contingent valuation made of the freshwater inflow into the Keurbooms Estuary near Plettenberg Bay, South Africa, in April 2001. The value of this water was estimated in terms of the services yielded to recreation users of the estuary, to be between R0,012/m3 and R0,046/m3. This value is currently lower than what farmers are willing to pay for the water in this area, as measured by the income capitalisation method, namely R0,125/m3, but may increase in the future as more and more South African estuaries are undermined through upstream river water abstraction, and recreational substitutes are diminished. A willingness-to-pay function was also estimated and show annual levies paid and investment in goods to access the estuary services to be important determinants of willingness-to-pay.

APA, Harvard, Vancouver, ISO, and other styles

20

Teske, Peter R., and Tris H. Wooldridge. "Affinities of some common estuarine macroinvertebrates to salinity and sediment type: empirical data from Eastern Cape estuaries, South Africa." African Zoology 39, no. 2 (October 2004): 183–92. http://dx.doi.org/10.1080/15627020.2004.11657215.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Montoya-Maya, P. H., and N. A. Strydom. "Description of Larval Fish Composition, Abundance and Distribution in Nine South and West Coast Estuaries of South Africa." African Zoology 44, no. 1 (April 2009): 75–92. http://dx.doi.org/10.3377/004.044.0108.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Montoya-Maya, P. H., and N. A. Strydom. "Description of larval fish composition, abundance and distribution in nine south and west coast estuaries of South Africa." African Zoology 44, no. 1 (April 2009): 75–92. http://dx.doi.org/10.1080/15627020.2009.11407441.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

O'Callaghan, M. "The ecology of the False Bay estuarine environments, Cape, South Africa. 1. The coastal vegetation." Bothalia 20, no. 1 (October 18, 1990): 105–11. http://dx.doi.org/10.4102/abc.v20i1.903.

Full text

Abstract:

The vegetation in and around eleven estuaries flowing into False Bay was surveyed during 1980 and 1981. Use was made of colour aerial photographs and a combination of dominance and phytosocioiogical techniques. Of the communities established, three are aquatic and four are described as emergent or wetlands. Of the terrestrial communities, five are described as fynbos and four occur on coastal sands. One community consists solely of alien plants. The communities thus classified generally compare well with those discussed by other workers in the area. However, differences due to the destruction and disturbance of the vegetation are commented upon.

APA, Harvard, Vancouver, ISO, and other styles

24

Martin, T. J. "Niche separation in Ambassis (Pisces: Perciformes) species co-existing in estuaries of south-east Africa." Journal of Fish Biology 35 (January 24, 2006): 321–28. http://dx.doi.org/10.1111/j.1095-8649.1989.tb03076.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Cyrus, D. P., and S. J. M. Blaber. "The influence of turbidity on juvenile marine fish in the estuaries of Natal, South africa." Continental Shelf Research 7, no. 11-12 (November 1987): 1411–16. http://dx.doi.org/10.1016/0278-4343(87)90046-x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Kibirige, I., R. Perissinotto, and X. Thwala. "A comparative study of zooplankton dynamics in two subtropical temporarily open/closed estuaries, South Africa." Marine Biology 148, no. 6 (December 7, 2005): 1307–24. http://dx.doi.org/10.1007/s00227-005-0175-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Harris, SA, and DP Cyrus. "Laval and Juvenile Fishes in the Surf Zone Adjacent to the St Lucia Estuary Mouth, KwaZulu-Natal, South Africa." Marine and Freshwater Research 47, no. 2 (1996): 465. http://dx.doi.org/10.1071/mf9960465.

Full text

Abstract:

Composition, seasonality and developmental stages of larval and juvenile fish in the surf zone adjacent to the St Lucia Estuary mouth, KwaZulu-Natal, were investigated. Samples were collected monthly, from February 1992 to January 1993, at six stations along the beach north of the estuary mouth. A 24-h study was also undertaken in the surf zone when the estuary mouth was closed. In the 12-month study a total of 2931 larvae, representing 88 taxa and 47 families, was collected. The most abundant families were the Sparidae, Haemulidae, Ambassidae, Tripterygiidae and Chanidae, together comprising 64.2% of the total catch. The most abundant species were Pomadasys olivaceum, Ambassis sp. and Rhabdosargus holubi. In the 24-h study a total of 13731 larvae, representing 43 taxa and 22 families, was collected and was dominated by Ambassis sp., Croilia mossambica and Chanos chanos. Temperature and turbidity were the most important environmental variables related to fish densities of estuary-associated species. Temporal changes in fish densities were most significant for daylnight catches, with densities being significantly higher at night than during the day. Fish species associated with estuaries peaked in abundance in mid autumn and late winter. Spatial trends in fish densities indicated significantly higher densities of estuary-associated species at Stations 2 and 3, with densities decreasing thereafter away from the estuary mouth. Larval stages were predominantly postflexion for all months sampled. The total catch was dominated by marine spawner species, with 36% of all taxa having some degree of estuarine association. Species with some degree of estuarine association dominated the catch in terms of density during both the 12-month study (60%) and the 24-h study (83%). Results from this study indicate that the surf zone adjacent to the St Lucia Estuary functions as a transit route and a nursery habitat for certain estuary- and non-estuary-associated fish species.

APA, Harvard, Vancouver, ISO, and other styles

28

Orr, KK, JE Burgess, and PW Froneman. "The effects of increased freshwater inflow on metal enrichment in selected Eastern Cape estuaries, South Africa." Water SA 34, no. 1 (December 11, 2018): 39. http://dx.doi.org/10.4314/wsa.v34i1.180760.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Lemley, DA, S. Taljaard, JB Adams, and N. Strydom. "Nutrient characterisation of river inflow into the estuaries of the Gouritz Water Management Area, South Africa." Water SA 40, no. 4 (October 14, 2014): 687. http://dx.doi.org/10.4314/wsa.v40i4.14.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Gyedu-Ababio, T. K. "Pollution Status of Two River Estuaries in the Eastern Cape, South Africa, based on Benthic Meiofauna Analyses." Journal of Water Resource and Protection 03, no. 07 (2011): 473–86. http://dx.doi.org/10.4236/jwarp.2011.37057.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Fernandes, M., and J. Adams. "Quantifying the loss of and changes in estuary habitats in the uMkhomazi and Mvoti estuaries, South Africa." South African Journal of Botany 107 (November 2016): 179–87. http://dx.doi.org/10.1016/j.sajb.2016.04.009.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Magoro, ML, T. Dalu, LRD Human, R. Perissinotto, SHP Deyzel, TH Wooldridge, JB Adams, and AK Whitfield. "Characterisation of selected micro-estuaries and micro-outlets in South Africa using microalgal, zooplanktonic and macrozoobenthic assemblages." African Journal of Aquatic Science 44, no. 4 (November 22, 2019): 313–27. http://dx.doi.org/10.2989/16085914.2019.1677211.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Nel, L., N. A. Strydom, and J. B. Adams. "Habitat partitioning in juvenile fishes associated with three vegetation types in selected warm temperate estuaries, South Africa." Environmental Biology of Fishes 101, no. 7 (May 26, 2018): 1137–48. http://dx.doi.org/10.1007/s10641-018-0762-y.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Carr, Andrew S., Mark D. Bateman, David L. Roberts, Colin V. Murray-Wallace, Zenobia Jacobs, and Peter J. Holmes. "The last interglacial sea-level high stand on the southern Cape coastline of South Africa." Quaternary Research 73, no. 2 (March 2010): 351–63. http://dx.doi.org/10.1016/j.yqres.2009.08.006.

Full text

Abstract:

The continental margin of southern South Africa exhibits an array of emergent marginal marine sediments permitting the reconstruction of long-term eustatic sea-level changes. We report a suite of optical luminescence ages and supplementary amino acid racemization data, which provide paleosea-level index points for three sites on this coastline. Deposits in the Swartvlei and Groot Brak estuaries display tidal inlet facies overlain by shoreface or eolian facies. Contemporary facies relations suggest a probable high stand 6.0-8.5 m above modern sea level (amsl). At Cape Agulhas, evidence of a past sea-level high stand comprises a gravel beach (ca. 3.8 m amsl) and an overlying sandy shoreface facies (up to 7.5 m amsl). OSL ages between 138±7 ka and 118±7 ka confirm a last interglacial age for all marginal marine facies. The high stand was followed by a sea-level regression that was associated with the accumulation of eolian dunes dating to between 122±7 ka and 113±6 ka. These data provide the first rigorous numerical age constraints for last interglacial sea-level fluctuations in this region, revealing the timing and elevation of the last interglacial high stand to broadly mirror a number of other far-field locations.

APA, Harvard, Vancouver, ISO, and other styles

35

Scharler, U. M., and D. Baird. "The influence of catchment management on salinity, nutrient stochiometry and phytoplankton biomass of Eastern Cape estuaries, South Africa." Estuarine, Coastal and Shelf Science 56, no. 3-4 (March 2003): 735–48. http://dx.doi.org/10.1016/s0272-7714(02)00293-7.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Miranda, Nelson A. F., Renzo Perissinotto, and Christopher C. Appleton. "Population Structure of an Invasive Parthenogenetic Gastropod in Coastal Lakes and Estuaries of Northern KwaZulu-Natal, South Africa." PLoS ONE 6, no. 8 (August 31, 2011): e24337. http://dx.doi.org/10.1371/journal.pone.0024337.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Froneman, PW. "Preliminary study on the food web structure of two contrasting estuaries along the Eastern Cape coast, South Africa." African Journal of Aquatic Science 25, no. 1 (January 2000): 13–22. http://dx.doi.org/10.2989/160859100780177622.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Mbande, Sekiwe, William Froneman, and Alan K. Whitfield. "The primary carbon sources utilised by fishes in the Mngazi and Mngazana estuaries, South Africa: a preliminary assessment." African Journal of Aquatic Science 29, no. 2 (August 2004): 195–204. http://dx.doi.org/10.2989/16085910409503810.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

O'Brien, G. C., R. Swemmer, and V. Wepener. "Ecological integrity assessment of the fish assemblages of the Matigulu/Nyoni and Umvoti estuaries, KwaZulu-Natal, South Africa." African Journal of Aquatic Science 34, no. 3 (December 2009): 293–302. http://dx.doi.org/10.2989/ajas.2009.34.3.11.987.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Adams, J. B., G. C. Bate, T. D. Harrison, P. Huizinga, S. Taljaard, L. van Niekerk, E. E. Plumstead, A. K. Whitfield, and T. H. Wooldridge. "A method to assess the freshwater inflow requirements of estuaries and application to the Mtata estuary, South Africa." Estuaries 25, no. 6 (December 2002): 1382–93. http://dx.doi.org/10.1007/bf02692232.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Froneman, P. William, and Ross N. Cuthbert. "Ratio-independent prey preferences by an estuarine mysid." Journal of Plankton Research 42, no. 3 (May 2020): 398–401. http://dx.doi.org/10.1093/plankt/fbaa024.

Full text

Abstract:

Abstract The present study quantified prey preferences by adult males and females of the mysid Mesopodopsis wooldridgei fed the calanoid copepods Pseudodiaptomus hessei and Paracartia longipatella at varying proportions. Both sexes of M. wooldridgei showed a lack of prey switching and a strong preference for the smaller, less active P. longipatella irrespective of density. Given a lack of low-density prey refuge, this finding may have important implications for the distribution of P. longipatella in estuaries along the eastern seaboard of South Africa. Results of the present study contribute to a growing body of literature that suggests that selective predation may play an important role in structuring plankton prey populations in shallow water ecosystems.

APA, Harvard, Vancouver, ISO, and other styles

42

Mackay, C. F., and D. P. Cyrus. "Is freshwater quality adequately defined by physico-chemical components? Results from two drought-affected estuaries on the east coast of South Africa." Marine and Freshwater Research 52, no. 3 (2001): 267. http://dx.doi.org/10.1071/mf98063.

Full text

Abstract:

From 1992 to 1994 the physico-chemical conditions of two systems on the east coast of southern Africa shifted from estuarine to freshwater as a result of mouth closure during the prevailing drought. Although there was gradual colonization by freshwater benthic invertebrates, both systems were dominated by estuarine benthic infauna. The upper reaches of the Siyaya Estuary were entirely characterized by freshwater taxa (95%) by 1994, whereas Nhlabane Estuary showed a smaller increase in the number of these fauna. Non-metric multidimensional scaling plotted benthic populations as separate groups each year. These groups were not the result of a gradual shift in benthic fauna from an estuarine towards a freshwater bias. Rather, the upper estuarine reaches were dominated by taxa characteristic of freshwater environments, despite similar water quality conditions along all reaches. Three quarters of the zoobenthic communities (expressed as density m–2) were still estuarine in nature. The two populations were comparable to those occurring in nearby freshwater coastal lakes, which have been subject to marine influence in geological history. It was concluded that assessment of the biological component in addition to the physico-chemical properties should be considered when defining water quality in such systems.

APA, Harvard, Vancouver, ISO, and other styles

43

Bennett, B. A. "A comparison of the fish communities in nearby permanently open, seasonally open and normally closed estuaries in the South-Western Cape, South Africa." South African Journal of Marine Science 8, no. 1 (June 1989): 43–55. http://dx.doi.org/10.2989/02577618909504550.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Nel, L., N. A. Strydom, R. Perissinotto, J. B. Adams, and D. A. Lemley. "Feeding ecology of Rhabdosargus holubi (family Sparidae) in multiple vegetated refugia of selected warm temperate estuaries in South Africa." Estuarine, Coastal and Shelf Science 197 (October 2017): 194–204. http://dx.doi.org/10.1016/j.ecss.2017.08.026.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Rajkaran, A., J. Adams, and R. Taylor. "Historic and recent (2006) state of mangroves in small estuaries from Mlalazi to Mtamvuna in KwaZulu-Natal, South Africa." Southern Forests: a Journal of Forest Science 71, no. 4 (December 2009): 287–96. http://dx.doi.org/10.2989/sf.2009.71.4.6.1033.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

James, Nicola C., Paul D. Cowley, Alan K. Whitfield, and Steve J. Lamberth. "Fish communities in temporarily open/closed estuaries from the warm- and cool-temperate regions of South Africa: A review." Reviews in Fish Biology and Fisheries 17, no. 4 (April 12, 2007): 565–80. http://dx.doi.org/10.1007/s11160-007-9057-7.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

de Lecea, Ander M., Rachel Cooper, and Albertus J. Smit. "Identifying the drivers of the pelagic ecosystem of an oligotrophic bight (KwaZulu–Natal, South Africa) using stable isotopes (δ13C, δ15N) and C : N ratio analysis." Marine and Freshwater Research 67, no. 11 (2016): 1750. http://dx.doi.org/10.1071/mf15256.

Full text

Abstract:

The international literature highlights the importance of understanding the role and fate of terrestrial organic matter (OM) in the marine system, yet little is known about this on the oligotrophic east coast of South Africa. Within the Bight, three important processes make OM biologically available: (1) a topographically induced upwelling cell (north), (2) a Cyclonic Eddy (south), and (3) riverine input. We hypothesise that: (i) these OM sources differ substantially in their isotope ratios, and (ii) zooplankton at the inshore region has an isotope signature linked to localised fluvial fluxes. Particulate OM samples were collected at five locations along the Bight and in three main estuaries during austral summer and winter seasons in 2010 and subjected to isotopic and mixing model analysis. Riverine input played an important role in this ecosystem inshore during the wet season. Only marine OM played a role as a biological driver offshore and at all sites during the dry season. Although there were indications that the upwelling cell did occur, it was not confirmed as active in either season. The current study provides valuable insights into the Bight's biological functioning and principle insights into the fate of terrestrial organic carbon on the east coast of southern Africa.

APA, Harvard, Vancouver, ISO, and other styles

48

Harrison, T. D. "A PRELIMINARY SURVEY OF ESTUARIES ON THE SOUTH-WEST COAST OF SOUTH AFRICA, CAPE HANGKLIP—CAPE AGULHAS, WITH PARTICULAR REFERENCE TO THE FISH FAUNA." Transactions of the Royal Society of South Africa 54, no. 2 (January 1999): 257–83. http://dx.doi.org/10.1080/00359199909520628.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Riddin, T., and J. B. Adams. "Predicting macrophyte states in a small temporarily open/closed estuary." Marine and Freshwater Research 63, no. 7 (2012): 616. http://dx.doi.org/10.1071/mf11224.

Full text

Abstract:

Temporarily open/closed estuaries (TOCEs) shift between abiotic states associated with mouth status. The aim of this study was to assess whether macrophyte states could be identified based on the dominant cover abundance of different species representative of specific habitats. A 5-year dataset of monthly macrophyte cover was assessed for the East Kleinemonde Estuary in South Africa. Three macrophyte states were identified: namely open and tidal (predominantly intertidal salt marsh); closed and low water level (predominantly salt marsh); and closed and high water level (with submerged macrophytes). The threshold water level for the change from salt marsh to submerged macrophytes was 1.6 m above mean sea level (amsl). A fourth state where macroalgae were dominant was identified for high salinity conditions (above 30 PSU). It was then possible to examine simulated water level data for different inflow scenarios to determine how often these macrophyte states occurred. Available macrophyte habitat was also calculated for different water levels using a spatial model written in Modelbuilder (ArcGIS 9.3.1). Both methods used to predict available macrophyte habitats are rapid, requiring only information on the elevation range of the main habitats, as well as present distribution and bathymetric maps. These predictive techniques are useful in the determination of the ecological water requirements of small estuaries.

APA, Harvard, Vancouver, ISO, and other styles

50

James, N. C., and T. D. Harrison. "A preliminary survey of the estuaries on the south coast of South Africa, Robberg Peninsula—Cape St Francis, with particular reference to the fish fauna." Transactions of the Royal Society of South Africa 64, no. 1 (January 2009): 14–31. http://dx.doi.org/10.1080/00359190909519235.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!